Myxophyceae 205 



moniliform; usually many within the sheath; heterocysts intercalary; go- 

 nidia not known. 



I Plant mass floccose, entangled; trichomes 9-12 mic. in diameter. 



H. solutum 



II Plant mass erect, caespitose, resembling Symploca; trichomes 6-7 mic. 



in diameter H. enteromorphoi- 



des. 



379. Hormothamnion solutum Bornet and Grunow in Bornet and Flahault. 



Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 259. 1888. De Toni. 

 Syll. Algar. 5: 486. 1907. 



Lemmermann. Algenfl. Sandwich.-Inseln. Bot. Jahrb. 34: 624. 1905. 



Plant mass floccose, entangled, mucous, green or blue-green; filaments 

 12-15 iti'c. in diameter, 5-6 mm. in length, soft, flaccid, free or coalesced 

 in numerous fascicles, erect; sheaths membranaceous, firm, colorless; 

 trichomes 9-12 mic. in diameter, constricted at joints; cells disc-shaped, 

 depressed, three or four times shorter than their diameter; heterocysts 

 somewhat quadrate. 



Hawaii. (Grunow). 



380. Hormothamnion enteromorphoides Grunow. Reise seiner Majestat 



Fregatte Novara um die Erde. Bot. Theil. i: 31. 1867. Bornet and 

 Thuret. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 260. 1888. 

 De Toni. Syll. Algar. 5: 486. 1907. 



Schramm and Maze. Essai Class. Algues Guadeloupe. 29. 1865. (S p h a e- 

 rozyga microcoleiformis Crouan). Murray. Catalogue of the 

 Marine Algae of the West Indian Region. Journ. of Bot. 27: 261. i88g. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 2. no. 56. 1895. Col- 

 lins. The Algae of Jamaica. Proc. Am. Acad. Arts Sci. 37: 241. 1901. 

 Vickers. Liste des Algues Marines de la Barbade. Ann. Sci. Nat. Bot. VIII. 

 i: SS- 1905- 



Plate X. fig. 13. 



Plant mass at first mucous, confluent, agglutinated, green or blue-green, 

 when older caespitose, formed from simple, erect, soft fascicles, rising from 

 a prostrate base, fastigiately branched; branches tapering at the apices; 

 filaments 7-9 mic. in diameter; sheaths mucous, colorless, delicate; trich- 

 omes 6-7 mic. in diameter, 7-10 mic. in length. 



Florida. Key West, Tortugas. (Farlow). West Indies. Guadeloupe. 

 (Duchassaing). In tufts from sandy bottom in shallow water. St. Ann's 

 Bay. March 1893; on coral reef, Navy Island, Jamaica. July 1897. (Hum- 

 phrey). Near Kingston, Jamaica. May 1901. (Duerden). Barbados. (Vick- 

 ers). 



Family III. SCYTONEMACEAE 



Filaments branched; false branches formed by the perforation of the 

 sheath by the trichome which thereupon issues as one or two long, flex- 



